Jay J.What Battery Does the Bronco Key Fob Use?
The 2021–2026 full-size Ford Bronco's factory Intelligent Access key fob uses one CR2450 3-volt lithium coin-cell battery. Do not buy a CR2032 for this remote. The CR2450 is wider and thicker, and Ford specifies it in the Bronco owner's manual. Check the label inside your existing fob if its remote has been replaced with a nonfactory model.
How Do You Replace the Key Fob Battery?
- Remove the emergency key. Press the release button on the key fob and pull out the mechanical key blade completely.
- Open the battery cover. Behind the removed key blade is a small cover-release tab. Insert a thin coin under the tab and gently twist it to lift the battery cover. Do not pry apart the entire fob along its outer seam.
- Remove the old CR2450. Use a small screwdriver at the battery-release point to lift the cell carefully. Avoid scraping the electronic contacts or circuit board.
- Install the new battery. Fit a CR2450 with the positive (+) side facing upward, as Ford specifies.
- Close and test the remote. Snap the battery cover firmly back into position, reinsert the emergency key, and test lock and unlock near the vehicle.
Ford advises leaving the protective grease on the battery terminals and circuit board intact. If the cover will not latch securely, stop using the fob until the housing is repaired or replaced.
How Do You Know the Battery Is Low?
The instrument cluster may display a low-remote-battery warning. You may also notice reduced locking range or intermittent button response. Replace the cell before it stops working entirely. If only one key fob misbehaves, test the spare fob: if the spare works normally at the same location, the problem is more likely inside the first fob than with the Bronco's receiver.
Will It Need Reprogramming?
No. Ford states that replacing the coin cell does not erase the remote's programming. Do not pay for key programming after an ordinary battery replacement. If the fob still fails, first check that the battery is a CR2450, installed positive side up, and seated against the contacts. Test with another new battery before assuming the key needs replacement.
Can You Start With a Dead Key Fob?
Yes. The mechanical key blade can unlock the driver's door. To start a push-button Bronco when the remote's coin cell is dead, use the passive-key backup location inside the center console described in your owner's manual, for the 2021 procedure, place the complete fob with buttons facing up and the unlock button toward the front of the vehicle in the backup slot, then press the brake and Start. Follow your model-year manual for any differences. The backup uses the fob's programmed security identification rather than its normal battery-powered remote signal. Keep your emergency blade installed in the fob so you can access the vehicle when the battery fails.
What if the Key Fob Still Fails?
Start with the new battery and its orientation. Confirm the cover is fully closed, then try the second programmed fob. If neither fob works, check the vehicle's 12-volt battery condition and any dashboard messages; the trouble may be on the vehicle side. If the housing was cracked or the contacts were bent while opening the remote, a replacement battery alone will not repair the damage. A new, unprogrammed fob is a different job from replacing its battery.
Coin-cell safety: Keep loose batteries away from children and pets. Swallowed button batteries can cause severe internal injury. Seek emergency medical care immediately if ingestion is suspected, and recycle the used cell appropriately.
Source: Ford 2025 Bronco Owner's Manual, Keys and Remote Controls.